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<?php $a = array('a'); $b = array('b'); var_dump($a + $b); $a = array('a' => 1); $b = array('b' => 2); var_dump($a + $b);
Output for 4.3.0 - 7.2.0
array(1) { [0]=> string(1) "a" } array(2) { ["a"]=> int(1) ["b"]=> int(2) }